[css-inline] maintain arabic shaping across initial-letter boundaries, issue #2399

Author: dauwhe

css-inline-3/Overview.bs

@@ -807,16 +807,18 @@ Sizing Initial Letters</h3>
 Shaping and Glyph Selection</h4>
 
 	When 'initial-letter' is not ''normal'',
-	shaping does not occur across the box's boundaries,
-	as if the zero-width non-joiner (U+200C) were inserted
-	before/after the <a>initial letter</a>.
+	shaping <em>should</em> still occur across the box's boundaries,
+	see [[css-text-3#boundary-shaping]].
 	For example, if the first letter of the Farsi word “پس”
 	were styled with ''initial-letter: 2 1'',
-	both letters would be styled in their isolated forms,
-	with “پ” as the initial letter, followed by the normally-styled “س”.
+	both letters would be styled in their joined forms,
+	with initial-form “ﭘ” as the <a>initial letter</a>,
+	followed by the normally-styled final-form “ﺲ”.
+	Note that the two letters might not always graphically connect,
+	even when shaped in their joining forms.
 
 	Issue: Are there other things we need to consider here?
-
+	
 <h3 id="initial-letter-exclusions">
 Space Around Initial Letters</h3>